3－乙酸基酚酮与芳醛缩合反应的研究

本文探讨了３－乙酰基酚酮与ＴＭＢ等芳香醛的羟醛缩合反应。３－乙酰基酚酮与ＴＭＢ、、丁香醛、胡椒醛等取代醛反应分别生成３－（３，４，５－三甲氧基）肉桂酰基酚酮、３－（４－羟基－３，５－二甲氧基）肉桂酰基酚酮、３－（３，４－亚甲二氧基）肉桂酰基酚酮。与桂皮醛反应生成３－（５－苯基－２，４－戊二烯酰基）酚酮等４种尚未见文献报道的新化合物。其结构经红外光谱、核磁共振谱及元素分析得以证实。     

3—乙酰基Zuo酚酮与芳醛缩合反应的研究

本文探讨了３－乙酰基Ｚｕｏ酚酮与ＴＭＢ等芳香醛的羟醛缩合反应。３－乙酰基Ｚｕｏ酚酮与ＴＭＢ、丁香醛戎椒醛等取代醛反应分别生成３－（３，４，５－三甲氧基）肉桂酰基Ｚｕｏ酚酮、３－（４－羟基－３，５－二甲氧基）肉桂酰基Ｚｕｏ酚酮、３－（３，４－亚甲二氧基）肉桂酰基Ｚｕｏ酚酮。与桂皮醛反应生成３－（５－苯基－２，４－戊二烯酰基）Ｚｕｏ酚酮等４种尚未见文献报道的新化合物。其结构经红外光谱、核磁巫振谱及元素     

TMB等与乙酰基酚酮缩合反应的研究

本文探讨了酚酮领域内的羟醛结合反应，３－乙酰基酚酮与ＴＭＢ、丁香醛、胡椒醛等取代醛反应分别生成３－（３，４，５－三甲氧基）肉桔酰基酚酮、３－（４－羟基－３，５－二甲氧基）肉桂酰基酚酮和３－（３，４亚甲－３，４－二氧基）肉桂基酚酮．与桂皮醛反应生成３－（５－苯基－２，４－戊二烯酰基）酚酮等四种尚未见文献报道的新化合物．其结构经红外光谱、核磁共振谱及元素分析得以证实．     

TMB等与乙酰基Zup酚酮缩合反应的研究

本文探讨了Ｚｕｏ酚酮领域内的羟醛缩合反应，３－乙酰基Ｚｕｏ酚酮与ＴＭＢ、丁香醛、胡椒醛等取代醛反应分别生成３－（３，４，５－三甲氧基）肉桔酰基Ｚｕｏ酚酮、３－（４－羟基－３，５－二甲氧基）肉桂酰基Ｚｕｏ酚酮和３－（３，４－亚甲－３，４－二氧基）肉桂基Ｚｕｏ酚酮。与桂皮醛反应生成３－（５－苯基－２，４－戊二烯酰基）Ｚｕｏ酚酮等四种尚未见文献报道的新化合物。其结构经红外光谱、核磁共振谱及元素分析得以证     

2—乙酰基—7—7甲胺基Zhou号TMB等取代芳香醛的反应

本文探讨了２－乙酰基－７甲胺基卓酮与３，４，５－三甲氧基苯甲醛等取代芳香醛的羟醛缩合反应。     

3-肉桂酰基酚酮5位单溴代产物的合成研究

研究了３－肉桂酰基酚酮的５位单溴代产物的合成。设计路线为：以２－肉桂酰基－７－甲氨基酮（１）为起始原料,首先进行溴化得到４－溴－２肉桂酰基－７－甲氨基酮（２）;化合物２在氢氧化钠碱性溶液中水解得到目标物５－溴－３－肉桂酰基酚酮（３）。化合物２、３为尚未见文献报道的新化合物,它们的结构经物理性质的测定、光谱数据和元素分析得到证实。     

3—肉桂酰基Zuo酚酮5位单溴代产物的合成研究

研究了３－肉桂酰基Ｚｕｏ酚酮的５位单溴代产物的合成。设计路线为：以２－肉桂酰基－７－甲氨基基Ｚｕｏ酮（１）为起始原料,首先进行溴化得一４－溴－２－肉桂酰基－７－甲氨基Ｚｕｏ酮（２）;化合物２在氢氧化钠碱性溶液中水解得到目标物５－溴－３－肉桂酰基Ｚｕｏ酚酮（３）,化合物２,３为尚未见文献报道的新化合物,它们的结构经物理性质的测定,光谱数据和元素分析得到证实。     

2－（3，4，5－三甲氧基）苯基4，9－二氢外庚并吡喃－4，9－二酮的一步合成

在原甲酸三乙酯和高氯酸的存在下，３－乙酰基酚酮１与３，４，５－三甲氧基苯甲醛（ＴＭＢ）２反应一步得到２－（３，４，５－三甲氧基）苯基－４，９－二氢环庚并吡喃－４，９－二酮３。化合物３为尚未见文献报道的新化合物，其结构经红外光谱、核磁共振谱及元素分析证实。     

羟胺和苯肼与肉桂酰基Zhuo酚酮的成环反应

羟胺和苯肼作为亲核试剂与３－（３，４，５－三甲氧基）肉桂酰基Ｚｈｏｕ酚酮和３－（３，４－亚甲二氧基）肉桂酰基Ｚｈｏｕ酚酮发生缩合反应分别得到３－（３，４，５－三甲氧基）苯乙烯基异恶唑并［５，４ｂ］Ｚｈｏｕ酮、３－（３，４－亚甲二氧基）苯乙烯基异恶唑并［５，４ｂ］Ｚｈｏｕ酮、３－（３，４，５－三甲氧基）苯乙烯基吡唑并［５，４ｂ］Ｚｈｏｕ酮和３－（３，４－亚甲二氧基）苯乙烯基吡唑并［５，４－ｂ］Ｚｈｏ     

羟胺和苯肼与肉桂酰基酚酮的成环反应

羟胺和苯肼作为亲核试剂与３－（３，４，５－三甲氧基）肉桂酰基酚酮和３－（３，４－亚甲二氧基）肉桂酰基酚酮发生缩合反应分别得到３－（３，４，５－三甲氧基）苯乙烯基异唑并［５，４－ｂ］酮、３－（３，４－亚甲二氧基）苯乙烯基异唑并［５，４－ｂ］酮、３－（３，４，５－三甲氧塞）苯乙烯基吡唑并［５，４－ｂ］酮和３－（３，４－亚甲二氧基）苯乙烯基吡唑并［５，４－ｂ］酮这４种缩杂环酮新化合物，其结构经红外光谱、核磁共振谱及元素分析证实。     

4-氨基-3,5-二氯-6-氟吡啶-2-酚的合成及机理探讨

在由3,5-二氯-2,4,6-三氟吡啶经氨取代、羟基取代得到4-氨基-3,5-二氯-6-氟吡啶-2-酚的过程中,我们发现4-氨基-3,5-二氯-2,6-二氟吡啶和2-氨基-3,5-二氯-4,6-二氟吡啶均可以转化为4-氨基-3,5-二氯-6-氟吡啶-2-酚,且收率和产物纯度均较高,我们对机理进行探讨,提出该现象的原因是在碱性水溶液中存在2-羟基吡啶的酮-醇异构互变。     

Semiflexible random thermotropic copolymers from 8‐(3‐hydroxy phenyl) octanoic acid and 3‐chloro‐4‐hydroxy benzoic acid/3,5‐dibromo‐4‐hydroxy benzoic acid

Two series of semiflexible random thermotropic copolymers containing 8‐(3‐hydroxy phenyl) octanoic acid (HPOA) with either 3‐chloro‐4‐hydroxy benzoic acid or 3,5‐dibromo‐4‐hydroxy benzoic acid were prepared by melt polycondensation techniques. The copolyesters were characterized with Fourier transform infrared spectroscopy, dilute solution viscometry, hot‐stage polarized light microscopy, differential scanning calorimetry, thermogravimetric analysis, and wide‐angle X‐ray diffraction. Studies revealed that the amount of HPOA as a disruptor incorporated into the backbone of substituted 4‐hydroxy benzoic acids had a detrimental effect on the liquid‐crystalline behavior. Mesophase‐transition temperatures were observed between 210 and 250°C, and the optical textures were of typical nematic phases. The degree of crystallinity decreased with an increase in the HPOA content. The thermal stability of the copolymers was in the range of 310–370°C. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

Kinetics of lipid oxidation in the presence of cinnamic acid derivatives

The effects of seven (prenyl‐ and methoxy‐) derivatives of cinnamic acid (0.1 mM) on the kinetics of lipid (sunflower oil triacylglycerols, TGSO) bulk phase oxidation at 80 °C have been compared. Synthesis of prenyl cinnamic acid derivatives: 3‐prenyl‐4‐hydroxy‐cinnamic acid (PHC), 3,5‐diprenyl‐4‐hydroxy‐cinnamic acid (DPHC), 2,2‐di‐methyl‐6‐carboxy‐ethenyl‐2H‐benzopyran (DMCB), 2,2‐dimethyl‐6‐carboxy‐ethenyl‐8‐prenyl‐2H‐benzopyran (DCEPB) present in Brazilian propolis has been performed. The monoprenyl derivative (PHC) has been found to exert a higher antioxidant activity as compared to the diprenyl derivative (DPHC). However, cinnamic acid derivatives DMCB and DCEPB have caused no change in the kinetics of TGSO oxidation. The results obtained have been compared with those on related compounds containing a cinnamic acid moiety as a structural feature, such as 4‐hydroxy‐cinnamic (p‐coumaric), 3‐methoxy‐4‐hydroxy‐cinnamic (ferulic) and 3,5‐dimethoxy‐4‐hydroxy‐cinnamic (sinapic) acids, as well as with data on butylated hydroxytoluene (BHT) and α‐tocopherol (αToc). PHC has shown a stronger antioxidant efficiency than BHT, p‐coumaric and ferulic acid, but a weaker antioxidant efficiency than α‐Toc and sinapic acid. The observed antioxidant effect of DPHC was stronger than that of p‐coumaric and ferulic acids and weaker than that of α‐Toc, BHT and sinapic acid.     

高效液相色谱法对β-羟基酮类衍生物的手性拆分

采用高效液相色谱法,以Chiralpak IA柱[直链淀粉-三(3,5-二甲基苯基氨基甲酸酯)]为手性固定相对新合成的7个含4-取代苯基4-羟基-丁-2-酮类衍生物对映体进行了手性拆分。通过考察不同流动相体系,优化了对映体色谱分离条件,同时初步探讨了在手性识别过程中流动相组成和极性对于对映体拆分和保留的影响。     

Synthesis of the Ammonium Salt of 6‐Amino‐2‐hydroxy‐ 3,5‐dinitropyrazine and a Comparison of its Properties with those of Ammonium 3,5‐Diaminopicrate (ADAP)

The ammonium salt of 6‐amino‐2‐hydroxy‐3,5‐dinitropyrazine has been synthesised from 2,6‐dimethoxy‐3,5‐dinitropyrazine and its properties (DSC, crystal structure, impact sensitiveness and thermochemical properties) are compared with the analogous benzene derivative, ammonium 3,5‐diaminopicrate.     

抗氧剂1010生产中加成反应工艺条件的优化

对由 2 ,6 -二叔丁基苯酚和丙烯酸甲酯进行加成反应合成 3,5甲酯的工艺条件进行了研究 ,分析讨论了反应物配比、加料方式、反应温度及反应时间等因素对加成反应的影响 ,优化了工艺条件。结果表明 ,新工艺条件下生产的 3,5 -二叔丁基 - 4羟基苯丙酸甲酯产品质量为优级品     

The effect of substitution levels on the luminescent and degradation properties of fluorescent poly(ester‐anhydride)s

In this work, two kinds of diacid monomers were synthesized by a convenient scheme, where 4‐hydroxy‐3‐methoxybenzoic acid (vanillic acid) or 4‐hydroxy‐3,5‐dimethoxybenzoic acid (syringic acid) directly condensated with succinic chloride. Corresponding polyanhydrides were obtained by melt polycondensation. Copolyanhydrides composed of the new monomers and sebacic acid (SA) were further prepared and characterized by NMR, DSC, and fluorometer. The two new kinds of polyanhydride emit strong fluorescence and have similar fluorescent spectra to poly(di(p‐carboxyphenyl) succinate anhydride) (P(dCPS)). The emission wavelength (λ_em) of the copolymers could be tuned by the excitation wavelength (λ_ex). Degradation rate of the copolyanhydrides decreased as dMOCPS or ddMOCPS fraction increased, and the degradation duration could be modulated from several days to more than 3 months. It addition, the copolyanhydrides displayed typical surface‐degradation characteristics. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1214–1221, 2006     

Effect of antiaging agents on the outdoor natural weathering of bamboo powder/polypropylene foamed composites

The effect of outdoor natural weathering on the properties of injection molded 33 wt% bamboo powder (BP)/polypropylene (PP) foamed composites with and without the antioxidant and hindered amine light stabilizers (HALS) were investigated. The composites containing the antiaging agents had higher color stability, slightly greater retentions of flexural modulus, tensile and notched impact strengths, higher creep resistance, and better rheological stability than the reference composite. The antiaging agents of pentaerythritol tetrakis(3‐(3,5‐di‐tert‐butyl‐4‐hydroxyphenyl)propionate) and poly‐(n‐hydroxyethyl‐2,2,6,6‐tetramethyl‐4‐hydroxy‐piperidyl succinate) had more beneficial effect than n‐octadecyl‐β‐(4‐hydroxy‐3,5‐di‐tert‐butyl‐phenyl)‐propionate and bis(2,2,6,6‐tetramethyl‐4‐piperidinyl)sebacate. After 12 months of exposure, △E^* decreased from 22.8 of the reference composite to 9.9 of the composite with the antiaging agents. Rheological behavior results indicated that the storage modulus, complex viscosity, and non‐Newtonian fluid index of composites containing the antiaging agents were slightly increased. Natural weathering caused less decreases in the storage and loss moduli, crossover modulus, relaxation time, and average molecular weight for composites containing the antiaging agents than those for the reference composite. Environmental scanning electron microscopy (ESEM) observation confirmed the improved surface durability for composites containing the antiaging agents. J. VINYL ADDIT. TECHNOL., 22:311–319, 2016. © 2014 Society of Plastics Engineers     

New fluorene‐based thermally stable five‐ and six‐membered rings polyimides with enhanced solubility

A novel ester diamine, 9‐(3,5‐diaminobenzoyloxy) fluorene, as a new monomer for preparation of polyimides was synthesized via two successive reactions. In the first step, reaction of 3,5‐dinitrobenzoylchloride with 9‐hydroxy fluorene in the presence of sodium hydroxide led to preparation of 9‐(3,5‐dinitrobenzoyloxy) fluorene. Second reaction was reduction of the nitro groups by tin (II) chloride and fuming hydrochloric acid to produce 9‐(3,5‐diaminobenzoyloxy) fluorene. The new diamine containing bulky fluorene group was characterized and polycondensed with different dianhydrides via two methods to produce polyimides. The new five‐membered and six‐membered ring polyimides were characterized and their properties including solubility behavior, inherent viscosity, thermal behavior and stability, and crystallinity were studied. They exhibited favorable balance of physical and thermal properties and their solubility were improved without sacrificing their thermal stability. Six‐membered rings polyimides showed higher thermal stability and lower solubility in comparison to related five‐membered ring polyimides. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Blue solid‐state luminescent tetraphenylethene–organophosphorus dyads with aggregation‐induced emission characteristics

Three novel tetraphenylethene–organophosphorus dyads – (6‐oxido‐6H‐dibenz[c,e][1,2]oxaphosphorin‐6‐yl)[4‐(1,2,2‐triphenylvinyl)phenyl] methanol, diphenyl {hydroxy[4‐(1,2,2‐triphenylvinyl)phenyl]methyl} phosphine oxide, and di(3,5‐dimethylphenyl){hydroxy[4‐(1,2,2‐triphenylvinyl)phenyl] methyl} phosphine oxide – were synthesised and characterised by ¹H, ¹³C, and ³¹P nuclear magnetic resonance spectroscopy, mass spectrometry, and elemental analysis. The photoluminescence properties were studied. All three dyads exhibited intense solid‐state blue emission peaking at 449–466 nm, and also displayed aggregation‐induced emission behaviours. The emission decays of these dyads in the solid state also fitted well with a triexponential model with an average lifetime of 2.65–4.42 ns. The experimental results demonstrated that the luminescent properties are highly dependent on the nature of the organophosphorus groups. The choice of phosphorus‐containing components can cause variations in the photoluminescence emission and photoluminescence decays.